Therapeutic treatment bed



Sept. 23, 1969 R. G. wlELAND THERAPEUTIC TREATMENT BED 2 Sheets-Sheet lFiled Aug. 10, 1967 F l G 3 Rmun G; Wieland BY @un ATTORNEY SePf- 231969 G. wlELAND 3,467,971

THERAPEUTIC TREATMENT BED Filed Aug. l0, 1967 2 Sheets-Sheet 2 INVENTORRoman G. Wieland *45 BY (Qa/w ATTORNEY United States Patent 3,467,971THERAPEUTIC TREATMENT BED Roman G. Wieland, Grand Forks, N. Dak.,assignor to Tri W-G, Inc., Valley City, N. Dak., a corporation of NorthDakota Filed Aug. 10, 1967, Ser. No. 659,642

Int. Cl. A61g 7 00 f. U.S. Cl. -63 1 Claim ABSTRACT OF THE DISCLOSUREThe invention comprises a therapeutic treatmentbed having an upper andlower frame, a bed mounted on the upper frame, said lower frame havingfour sleeves with horizontal bars connecting certain of said sleevestogether in fixed relation, said sleeves forming corner posts for saidframe, said upper frame having four corner posts with horizontal barsconnecting said posts together in fixed relation, said corner postsbeing adapted to telescope into said sleeves, a chain drive extending toopposite ends of said lower frame, a pair of shafts mounted to oppositeends of said lower frame with gears mounted to the opposite ends of saidlower frame, a motor mounted to said lower frame and adapted to drivesaid chain drive with said chain drive driving said gears, said upperframe having rack portions to engage said gears whereby the.activa tionof the motor will drive the chains in either direction and will therebydrive the gears in either direction to raise and lower the upper frameand bed relative to the lower frame, an adjustable tension bar extendingbetween said shafts centrally along the lower frame to keep said shaftsin axial alignment, L-shaped shielding plates mounted to said sleevesand said posts in telescoping relation to shield the corners of saidupper and lower frame.

This invention relates to hospital beds or more particularly theinvention relates to therapeutic beds.

It is an object of this invention to provide a novel therapeutic bedwhich is powered by a motor to be raised and lowered.

It is a further object of this invention to provide a novel simplifiedtherapeutic bed or plinth which can be automatically raised and loweredunder power.

It is another object of the invention to provide a novel therapeutic bedwhich can be raised and lowered by a motor and which has shieldingstructure to shield the raising and lowering structure from the patientupon the bed.

Further objects and advantages of the invention will become apparent asthe description proceeds and when taken in conjunction with theaccompanying drawings wherein.

FIGURE 1 is a perspective view of the therapeutic bed invention.

FIGURE 2 is a fragmentary top plan view of the therapeutic bed.

FIGURE 3 is a side elevational view of the therapeutic bed.

FIGURE 4 is a cross-section view taken along line 4 4 of FIGURE 3.

FIGURE 5 is a perspective view of the driving structure for raising andlowering the therapeutic bed.

FIGURE 6 is a fragmentary end view of the therapeutic bed.

FIGURE 7 is a schematic circuitry diagram of the electric system forraising and lowering the therapeutic bed.

Briefly stated, the invention comprises a therapeutic bed having a bedand rectangular frame with four legs projecting vertically, a secondrectangular frame beneath said first `frame with four sleeves adapted toslidably receive ICC the legs of said first frame, six pair of toothedgears mounted to said second frame adjacent said legs and adapted toengage rack portions along said frame, a chain drive disposed centrallyalong said second frame, and driving said gear adjacent said leg,shielding plates draped about the corners of said first and second framewith the shielding plates of the first frame adapted to slide over theshielding plates of the second frame, and a motor lfor powering thechain drive to raise and lower the bed and frst'rectangular framerelative to the second frame.

Referring more particularly to the drawings, in FIG- URE 1, thetherapeutic bed or plinth invention is illustrated having a bed 21 witha rectangular frame 22 having four legs 23, 24, 25 and 26 fixed to thecorners and depending vertically therefrom, each leg 23-26 has a rackportion 27 along their inner faces. Beneath the frame 22 is a secondrectangular frame 28 having four vertical sleeves 29, 30, 31 and 32 toreceive the legs 23-26 in telescoping relation. A chain drive 33 ismounted centrally along the second frame. The chain drive 33 has two.Endless link chains 34 and 35 are driven by a pair of toothed gears 36and 37 mounted coaxially onto the output shaft 38 of a conventional gearreduction mechanism 39 in a conventional manner and the gear reductionmechanism in turn drives the gears 36 and 37.

At the outer ends 36 and 37 of the chains 36 and 37 are toothed gears 40and 41 which are fixed coaxially onto shafts 42 and 43 respectively.

At the outer ends of shaft 42 are a pair of toothed gears 44 and 45which mesh with the rack portions 27 of the legs 23 and 24. At the outerends of shaft 43 are a pair of gears 46 and 47 which mesh with the rackportions 27 of the legs 25 and 26.

Four rectangular housing members 48 are fixed to the sleeves 29, 30, 31and 32, respectively of the second frame. The housing members 48 haveopen ends 49 along the side that faces the rack portion 27 of the legs23-26. The gears 44, 45, 46 and 47 have their shafts 42 and 43 rotatablymounted in the housing members 48.

Mounted along the outside of the second frame 28 are a pair of shieldingplates 49 and 50 which surround the ends 28' and 28" of the second frame28. A pair of shielding plates 51 and 52 are fixed to the firstrectangular frame 22 and telescope over the outside of shielding plates49 and 50. The shielding plates 51 and 52 have diagonal corners 53, sothat as the second frame is lowered, the corners of the plates 51 and 52will not accidentally cut into the shoes on the feet of a personstanding nearby. The first rectangular frame will lower down until thelower edges 51 and 52' of the shielding plates 51 and 52 are even withthe lower edges 49 and 50 of the shielding plates 49 and 50, so thatthere will be space between the shielding plates 51 and 52, and 49 and50 for a persons foot to pass underneath when the first frame islowered, as soon as the lower edges 51 and 52 of the shielding plates 51and 52 become even with the lower edge 49 and 50', frame 21 will engagea limit switch 65 which stops and reverses the motor 67 causing thesecond `frame to be driven upward again.

An elongated tension bar 55 extends longitudinally along the length ofthe second frame 28. The tension bar 55 has a short rod 56 slidablymounted in a bore 60 at one end of the tension bar 55. The short rod 56has a bearing block 57 fixed to one end of the rod. The block 57 hassleeve portion with a bore 58 therethrough. The shaft 42 is rotatablymounted Vin the bore 58 of the block 57 and the other end of the rod 56is slidably mounted in a bore 60 of tension bar 55. The short rod 56 isthreaded along its other end 56 and a nut 61 is threaded onto that endand abuts the end 55 of the tension bar. At the other end of the tensionbar 55 is another bearing block 62 which has sleeve portion with a bore62' therethrough and the shaft 43 is rotatably mounted in the block 62.The tension bar acts to keep the shafts 42 and 43 spaced apart as theweight of the chains and the action of the chain drive have a tendencyto draw the shafts toward one another, and it is the function of thetension bar 55 to keep the shafts 42 and 43 spaced apart and inalignment.

The bearing blocks 57 and 62 may be adjusted away from one another bythreading the nut 6'1 along the threaded end 56 forcing the end 55' ofthe tension bar away from the short rod 56, thus spacing the bearingblocks 57 and 62 further apart, conversely, the blocks may be adjustedtoward one another by threading the nut 61 in the opposite direction.

OPERATION The therapeutic bed invention is operated as follows:

The manually operated switches 73, 73 and 73 are connected togethermechanically so that they move in unison either upward or downward whenviewed from FIGURE 7. Limit switches 65 and 66 are normally closed,which stop the motor when the upper bed frame 22 has teiescoped upwardyfully telescoping the legs 23, 24, 25 and 26 upward in the sleeves 29,30, 31 and 32 of the lower frame or has retracted fully.

The motor 64 of a conventional type which can be reversed by reversingthe leads 74 and 74 by switching switches 73, 73 and 73 either upward ordownward.

When the master switch 75 is closed the motor 64 will be activated whichdrives the gear reduction mechanism 39 which has an output shaft 38which drives the gears 36 and 37 xed to the output shaft 38. The gears36 and 37 drive the chains 34 and 35 respectively and the chain 34 and35 drives 40 and 41 respectively, thereby driving shafts 42 and 43 inthe same direction causing gears 44, 45, 46 and 47 to engage the rackportions 27 of the legs 23-26, and drive the legs 23-26 upward in thesleeves until the limit switch 66 is engaged which turns o the motor.The operator will then reverse switches 73, 73' and 73 which reactivatesthe motor in the opposite direction, retracting the legs 23-26 downwardinto the sleeves 29-32 until the limit switch 65 is engaged, which againturns ott the motor 64 until the switches 73, 73 and 73l are againreversed.

The operator may turn off the motor 64 at any time by opening the masterswitch 75.

The shielding plates 51 and S2 which cover the backs and side corners ofthe telescoping bed invention to prevent a patient lying on the bed 21of the bed invention from accidentally getting his hands into the rackportions 27. A metal cover 77 is also provided which has a iiat top 78and tapered opposing sides 79 and 79 which cover the chain drive andmotor area of the invention, so as to keep persons from accidentallyreaching into that area.

The bed invention also has an open area 79 with a bottom plate 80, whichserves as a storage area.

Thus, it will be seen that a novel therapeutic bed invention has beenprovided which can be automatically raised and lowered by a motor to anadjusted position for therapeutic treatment and which provides a safesimplified construction.

What is claimed is:

1. A therapeutic treatment bed comprising an upper and lower frame, abed mounted on the upper frame, said lower frame having four sleeveswith horizontal bars connecting certain of said sleeves together in ixedrelation, said sleeves forming corner posts for said frame, said upperframe having four corner posts with horizontal bars connecting saidposts together in xed relation, said corner posts being adapted totelescope into said sleeves, a chain drive extending to opposite ends ofsaid lower frame, a pair of shafts mounted to opposite ends of saidlower frame with gears mounted to the opposite ends of said lower frame,a motor mounted to said lower frame and adapted to drive said chaindrive with said chain drive driving said gears, said upper frame havingrack portions to engage said gears whereby the activation of the motorwill drive the chains in either direction and will thereby drive thegears in either direction to raise and lower the upper frame and bedrelative to the lower frame, an adjustable tension bar extending betweensaid shafts centrally along the lower frame to keep said shafts in axialalignment, L-shaped shielding plates mounted to said sleeves and saidposts in telescoping relation to shield the corners of said upper andlower frame.

References Cited UNITED STATES PATENTS 2,827,641 3/1958'- Reichert et al5-63 3,045,256 7/1962 Scher 5"-63 3,247,528 4/ 1966 Swenson et al 5-623,281,872 11/1966 Dewey 5--63 3,317,931 5/1967 Benoit et al 5-63 XCASMIR A. NUN BERG, Primary Examiner U,S. Cl. X.R. 5-83; 10S-147

